Infrequent Sound [sex.tex] technology: Sony STR-6036 FM Stereo / FM-AM Receiver Solid State, 1971-1974, made in Japan

Link: radiomuseum | hifiengine | thevintageknob | service manual

There are later "A" versions of both : STR-6036A, STR-6046A.
The 36A has two buttons for speaker selection (as in the 46) ; the 46A has a bigger power section with an added heatsink that shows through the back plate but no speaker fuses.

Specifications
Tuning range: FM, MW
Power output: 14 watts per channel into 8Ω (stereo)
Frequency response: 30Hz to 40kHz
Total harmonic distortion: 0.8%
Input sensitivity: 2mV (mic), 2.5mV (MM), 250mV (line)
Signal to noise ratio: 60dB (mic), 60dB (MM), 80dB (line)
Output: 250mV (line)
Speaker load impedance: 4Ω to 16Ω

Output power: 2 × 22 W / 8 Ω, 2 × 25 W / 4 Ω.
Semiconductors: 1 x FET, 39 x transistors, 21 x diodes
Dimensions: 434 x 144 x 345mm
Weight: 8.5kg
Year: 1973